Two Rab5 Homologs Are Essential for the Development and Pathogenicity of the Rice Blast Fungus Magnaporthe oryzae

Frontiers in Plant Science
Cheng D YangJie Zhou

Abstract

The rice blast fungus, Magnaporthe oryzae, infects many economically important cereal crops, particularly rice. It has emerged as an important model organism for studying the growth, development, and pathogenesis of filamentous fungi. RabGTPases are important molecular switches in regulation of intracellular membrane trafficking in all eukaryotes. MoRab5A and MoRab5B are Rab5 homologs in M. oryzae, but their functions in the fungal development and pathogenicity are unknown. In this study, we have employed a genetic approach and demonstrated that both MoRab5A and MoRab5B are crucial for vegetative growth and development, conidiogenesis, melanin synthesis, vacuole fusion, endocytosis, sexual reproduction, and plant pathogenesis in M. oryzae. Moreover, both MoRab5A and MoRab5B show similar localization in hyphae and conidia. To further investigate possible functional redundancy between MoRab5A and MoRab5B, we overexpressed MoRAB5A and MoRAB5B, respectively, in MoRab5B:RNAi and MoRab5A:RNAi strains, but neither could rescue each other's defects caused by the RNAi. Taken together, we conclude that both MoRab5A and MoRab5B are necessary for the development and pathogenesis of the rice blast fungus, while they may function independently.

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Citations

Nov 27, 2018·Virulence·Xue-Ming ZhuFu-Cheng Lin
Oct 2, 2020·Environmental Microbiology·Jinrong YinXue Zhang
Feb 26, 2021·Mycology·Blake Commer, Brian D Shaw
Mar 30, 2021·Frontiers in Microbiology·Xinrong ZhangXiao-Lin Chen

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Methods Mentioned

BETA
PCR
transmission electron microscopy
confocal microscopy
GTPase

Software Mentioned

Beacon Designer
DNAMAN6

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